nvram.c (c7fb577e2a6cb04732541f2dc402bd46747f7558) nvram.c (866237eafc60637a2c9875167486f61d86892c6b)
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

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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
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

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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 Jon Ringle: Comdial MP1000 support
36 *
37 */
38
35 */
36
39#define NVRAM_VERSION "1.3"
37#define NVRAM_VERSION "1.2"
40
41#include <linux/module.h>
42#include <linux/config.h>
43#include <linux/sched.h>
44#include <linux/smp_lock.h>
45#include <linux/nvram.h>
46
47#define PC 1
48#define ATARI 2
49#define COBALT 3
38
39#include <linux/module.h>
40#include <linux/config.h>
41#include <linux/sched.h>
42#include <linux/smp_lock.h>
43#include <linux/nvram.h>
44
45#define PC 1
46#define ATARI 2
47#define COBALT 3
50#define MP1000 4
51
52/* select machine configuration */
53#if defined(CONFIG_ATARI)
54# define MACH ATARI
55#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
56#define MACH PC
57# if defined(CONFIG_COBALT)
58# include <linux/cobalt-nvram.h>
59# define MACH COBALT
48
49/* select machine configuration */
50#if defined(CONFIG_ATARI)
51# define MACH ATARI
52#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
53#define MACH PC
54# if defined(CONFIG_COBALT)
55# include <linux/cobalt-nvram.h>
56# define MACH COBALT
60# elif defined(CONFIG_MACH_MP1000)
61# undef MACH
62# define MACH MP1000
63# else
64# define MACH PC
65# endif
66#else
67# error Cannot build nvram driver for this machine configuration.
68#endif
69
70#if MACH == PC

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113#define ATARI_CKS_LOC 48
114
115#define mach_check_checksum atari_check_checksum
116#define mach_set_checksum atari_set_checksum
117#define mach_proc_infos atari_proc_infos
118
119#endif
120
57# else
58# define MACH PC
59# endif
60#else
61# error Cannot build nvram driver for this machine configuration.
62#endif
63
64#if MACH == PC

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107#define ATARI_CKS_LOC 48
108
109#define mach_check_checksum atari_check_checksum
110#define mach_set_checksum atari_set_checksum
111#define mach_proc_infos atari_proc_infos
112
113#endif
114
121#if MACH == MP1000
122
123/* RTC in a MP1000 */
124#define CHECK_DRIVER_INIT() 1
125
126#define MP1000_CKS_RANGE_START 0
127#define MP1000_CKS_RANGE_END 111
128#define MP1000_CKS_LOC 112
129
130#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
131
132#define mach_check_checksum mp1000_check_checksum
133#define mach_set_checksum mp1000_set_checksum
134#define mach_proc_infos mp1000_proc_infos
135
136#endif
137
138/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
139 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
140 * don't want two different things trying to get to it at once. (e.g. the
141 * periodic 11 min sync from time.c vs. this driver.)
142 */
143
144#include <linux/types.h>
145#include <linux/errno.h>

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933 (vmode & 16 ? ", line doubling" : ", half screen") : "");
934
935 return 1;
936}
937#endif
938
939#endif /* MACH == ATARI */
940
115/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
116 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
117 * don't want two different things trying to get to it at once. (e.g. the
118 * periodic 11 min sync from time.c vs. this driver.)
119 */
120
121#include <linux/types.h>
122#include <linux/errno.h>

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910 (vmode & 16 ? ", line doubling" : ", half screen") : "");
911
912 return 1;
913}
914#endif
915
916#endif /* MACH == ATARI */
917
941#if MACH == MP1000
942
943static int
944mp1000_check_checksum(void)
945{
946 int i;
947 unsigned short sum = 0;
948 unsigned short expect;
949
950 for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
951 sum += __nvram_read_byte(i);
952
953 expect = __nvram_read_byte(MP1000_CKS_LOC+1)<<8 |
954 __nvram_read_byte(MP1000_CKS_LOC);
955 return ((sum & 0xffff) == expect);
956}
957
958static void
959mp1000_set_checksum(void)
960{
961 int i;
962 unsigned short sum = 0;
963
964 for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
965 sum += __nvram_read_byte(i);
966 __nvram_write_byte(sum >> 8, MP1000_CKS_LOC + 1);
967 __nvram_write_byte(sum & 0xff, MP1000_CKS_LOC);
968}
969
970#ifdef CONFIG_PROC_FS
971
972#define SERVER_N_LEN 32
973#define PATH_N_LEN 32
974#define FILE_N_LEN 32
975#define NVRAM_MAGIC_SIG 0xdead
976
977typedef struct NvRamImage
978{
979 unsigned short int magic;
980 unsigned short int mode;
981 char fname[FILE_N_LEN];
982 char path[PATH_N_LEN];
983 char server[SERVER_N_LEN];
984 char pad[12];
985} NvRam;
986
987static int
988mp1000_proc_infos(unsigned char *nvram, char *buffer, int *len,
989 off_t *begin, off_t offset, int size)
990{
991 int checksum;
992 NvRam* nv = (NvRam*)nvram;
993
994 spin_lock_irq(&rtc_lock);
995 checksum = __nvram_check_checksum();
996 spin_unlock_irq(&rtc_lock);
997
998 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
999
1000 switch( nv->mode )
1001 {
1002 case 0 :
1003 PRINT_PROC( "\tMode 0, tftp prompt\n" );
1004 break;
1005 case 1 :
1006 PRINT_PROC( "\tMode 1, booting from disk\n" );
1007 break;
1008 case 2 :
1009 PRINT_PROC( "\tMode 2, Alternate boot from disk /boot/%s\n", nv->fname );
1010 break;
1011 case 3 :
1012 PRINT_PROC( "\tMode 3, Booting from net:\n" );
1013 PRINT_PROC( "\t\t%s:%s%s\n",nv->server, nv->path, nv->fname );
1014 break;
1015 default:
1016 PRINT_PROC( "\tInconsistant nvram?\n" );
1017 break;
1018 }
1019
1020 return 1;
1021}
1022#endif
1023
1024#endif /* MACH == MP1000 */
1025
1026MODULE_LICENSE("GPL");
1027
1028EXPORT_SYMBOL(__nvram_read_byte);
1029EXPORT_SYMBOL(nvram_read_byte);
1030EXPORT_SYMBOL(__nvram_write_byte);
1031EXPORT_SYMBOL(nvram_write_byte);
1032EXPORT_SYMBOL(__nvram_check_checksum);
1033EXPORT_SYMBOL(nvram_check_checksum);
1034MODULE_ALIAS_MISCDEV(NVRAM_MINOR);
918MODULE_LICENSE("GPL");
919
920EXPORT_SYMBOL(__nvram_read_byte);
921EXPORT_SYMBOL(nvram_read_byte);
922EXPORT_SYMBOL(__nvram_write_byte);
923EXPORT_SYMBOL(nvram_write_byte);
924EXPORT_SYMBOL(__nvram_check_checksum);
925EXPORT_SYMBOL(nvram_check_checksum);
926MODULE_ALIAS_MISCDEV(NVRAM_MINOR);