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-rw-r--r--drivers/char/nvram.c110
1 files changed, 109 insertions, 1 deletions
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 1af733d07321..9e24bbd4090c 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -32,9 +32,11 @@
32 * added changelog 32 * added changelog
33 * 1.2 Erik Gilling: Cobalt Networks support 33 * 1.2 Erik Gilling: Cobalt Networks support
34 * Tim Hockin: general cleanup, Cobalt support 34 * Tim Hockin: general cleanup, Cobalt support
35 * 1.3 Jon Ringle: Comdial MP1000 support
36 *
35 */ 37 */
36 38
37#define NVRAM_VERSION "1.2" 39#define NVRAM_VERSION "1.3"
38 40
39#include <linux/module.h> 41#include <linux/module.h>
40#include <linux/config.h> 42#include <linux/config.h>
@@ -45,6 +47,7 @@
45#define PC 1 47#define PC 1
46#define ATARI 2 48#define ATARI 2
47#define COBALT 3 49#define COBALT 3
50#define MP1000 4
48 51
49/* select machine configuration */ 52/* select machine configuration */
50#if defined(CONFIG_ATARI) 53#if defined(CONFIG_ATARI)
@@ -54,6 +57,9 @@
54# if defined(CONFIG_COBALT) 57# if defined(CONFIG_COBALT)
55# include <linux/cobalt-nvram.h> 58# include <linux/cobalt-nvram.h>
56# define MACH COBALT 59# define MACH COBALT
60# elif defined(CONFIG_MACH_MP1000)
61# undef MACH
62# define MACH MP1000
57# else 63# else
58# define MACH PC 64# define MACH PC
59# endif 65# endif
@@ -112,6 +118,23 @@
112 118
113#endif 119#endif
114 120
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
115/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with 138/* 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 139 * 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 140 * don't want two different things trying to get to it at once. (e.g. the
@@ -915,6 +938,91 @@ atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
915 938
916#endif /* MACH == ATARI */ 939#endif /* MACH == ATARI */
917 940
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
918MODULE_LICENSE("GPL"); 1026MODULE_LICENSE("GPL");
919 1027
920EXPORT_SYMBOL(__nvram_read_byte); 1028EXPORT_SYMBOL(__nvram_read_byte);