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[ARM] 2921/1: Support for the RTC / nvram on the Comdial MP1000 

Patch from Jon Ringle

This adds support for the RTC and nvram on the Comdial MP1000

Signed-off-by: Jon Ringle
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jon Ringle 2005-10-28 16:27:24 +01:00 committed by Russell King
parent d9e2964987
commit dd5b295ff8
1 changed files with 109 additions and 1 deletions
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110
drivers/char/nvram.c
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@ -32,9 +32,11 @@
* added changelog
* 1.2 Erik Gilling: Cobalt Networks support
* Tim Hockin: general cleanup, Cobalt support
* 1.3 Jon Ringle: Comdial MP1000 support
*
*/
#define NVRAM_VERSION "1.2"
#define NVRAM_VERSION "1.3"
#include <linux/module.h>
#include <linux/config.h>
@ -45,6 +47,7 @@
#define PC 1
#define ATARI 2
#define COBALT 3
#define MP1000 4
/* select machine configuration */
#if defined(CONFIG_ATARI)
@ -54,6 +57,9 @@
# if defined(CONFIG_COBALT)
# include <linux/cobalt-nvram.h>
# define MACH COBALT
# elif defined(CONFIG_MACH_MP1000)
# undef MACH
# define MACH MP1000
# else
# define MACH PC
# endif
@ -112,6 +118,23 @@
#endif
#if MACH == MP1000
/* RTC in a MP1000 */
#define CHECK_DRIVER_INIT() 1
#define MP1000_CKS_RANGE_START 0
#define MP1000_CKS_RANGE_END 111
#define MP1000_CKS_LOC 112
#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
#define mach_check_checksum mp1000_check_checksum
#define mach_set_checksum mp1000_set_checksum
#define mach_proc_infos mp1000_proc_infos
#endif
/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
* rtc_lock held. Due to the index-port/data-port design of the RTC, we
* 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,
#endif /* MACH == ATARI */
#if MACH == MP1000
static int
mp1000_check_checksum(void)
{
int i;
unsigned short sum = 0;
unsigned short expect;
for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
sum += __nvram_read_byte(i);
expect = __nvram_read_byte(MP1000_CKS_LOC+1)<<8 |
__nvram_read_byte(MP1000_CKS_LOC);
return ((sum & 0xffff) == expect);
}
static void
mp1000_set_checksum(void)
{
int i;
unsigned short sum = 0;
for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
sum += __nvram_read_byte(i);
__nvram_write_byte(sum >> 8, MP1000_CKS_LOC + 1);
__nvram_write_byte(sum & 0xff, MP1000_CKS_LOC);
}
#ifdef CONFIG_PROC_FS
#define SERVER_N_LEN 32
#define PATH_N_LEN 32
#define FILE_N_LEN 32
#define NVRAM_MAGIC_SIG 0xdead
typedef struct NvRamImage
{
unsigned short int magic;
unsigned short int mode;
char fname[FILE_N_LEN];
char path[PATH_N_LEN];
char server[SERVER_N_LEN];
char pad[12];
} NvRam;
static int
mp1000_proc_infos(unsigned char *nvram, char *buffer, int *len,
off_t *begin, off_t offset, int size)
{
int checksum;
NvRam* nv = (NvRam*)nvram;
spin_lock_irq(&rtc_lock);
checksum = __nvram_check_checksum();
spin_unlock_irq(&rtc_lock);
PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
switch( nv->mode )
{
case 0 :
PRINT_PROC( "\tMode 0, tftp prompt\n" );
break;
case 1 :
PRINT_PROC( "\tMode 1, booting from disk\n" );
break;
case 2 :
PRINT_PROC( "\tMode 2, Alternate boot from disk /boot/%s\n", nv->fname );
break;
case 3 :
PRINT_PROC( "\tMode 3, Booting from net:\n" );
PRINT_PROC( "\t\t%s:%s%s\n",nv->server, nv->path, nv->fname );
break;
default:
PRINT_PROC( "\tInconsistant nvram?\n" );
break;
}
return 1;
}
#endif
#endif /* MACH == MP1000 */
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(__nvram_read_byte);